feat(app): collapse workspace header button labels on narrow rows

Measure the header row width and hide text labels on the Open,
Scripts, and git action split buttons below 700px so the header
fits without wrapping on split-pane layouts.

packages/app/src/components/headers/screen-header.tsx

@@ -1,4 +1,5 @@
 import type { ReactNode } from "react";
+import type { LayoutChangeEvent } from "react-native";
 import { View, type StyleProp, type ViewStyle } from "react-native";
 import { useSafeAreaInsets } from "react-native-safe-area-context";
 import { StyleSheet, useUnistyles } from "react-native-unistyles";
@@ -17,6 +18,7 @@ interface ScreenHeaderProps {
   leftStyle?: StyleProp<ViewStyle>;
   rightStyle?: StyleProp<ViewStyle>;
   borderless?: boolean;
+  onRowLayout?: (event: LayoutChangeEvent) => void;
 }
 
 /**
@@ -29,6 +31,7 @@ export function ScreenHeader({
   leftStyle,
   rightStyle,
   borderless,
+  onRowLayout,
 }: ScreenHeaderProps) {
   const { theme } = useUnistyles();
   const insets = useSafeAreaInsets();
@@ -42,6 +45,7 @@ export function ScreenHeader({
     <View style={styles.header}>
       <View style={[styles.inner, { paddingTop: insets.top + topPadding }]}>
         <View
+          onLayout={onRowLayout}
           style={[
             styles.row,
             {
@@ -84,11 +88,13 @@ const styles = StyleSheet.create((theme) => ({
     flexDirection: "row",
     alignItems: "center",
     gap: theme.spacing[2],
+    minWidth: 0,
   },
   right: {
     flexDirection: "row",
     alignItems: "center",
     gap: theme.spacing[2],
+    flexShrink: 0,
   },
   borderless: {
     borderBottomColor: "transparent",

packages/app/src/components/headers/screen-title.tsx

@@ -25,6 +25,7 @@ export function ScreenTitle({ children, numberOfLines = 1, testID, style }: Scre
 const styles = StyleSheet.create((theme) => ({
   text: {
     flexShrink: 1,
+    minWidth: 0,
     fontSize: theme.fontSize.base,
     fontWeight: {
       xs: "400",